Kazu Hirata 0a81ace004 [mlir] Use std::optional instead of llvm::Optional (NFC) ...

This patch replaces (llvm::|)Optional< with std::optional<.  I'll post
a separate patch to remove #include "llvm/ADT/Optional.h".

This is part of an effort to migrate from llvm::Optional to
std::optional:

https://discourse.llvm.org/t/deprecating-llvm-optional-x-hasvalue-getvalue-getvalueor/63716

2023-01-14 01:25:58 -08:00

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